Metals equivalent weight values

The highest capacities are due to hydrogen (cf. Table 1), but hydrogen is difficult to store, and a practical solution has only recently been found in metal hydride/nickel oxide accumulators, where ATj, h for the metal hydride falls, unfortunately, to about 1% of the value for pure hydrogen. Carbon is a light element with a low equivalent weight of 3, but the total irreversibility of the reaction... 

Calculation based on humic cation-exchange capacity data obtained by Stuermer and Harvey (1974, 1977) fulvic acid (FA) concentration in Sargasso Sea = 0.134 mg 1" (49.98% C) equivalent weight = 473 g the FA carbon represents 5.1% of the DOC it is assumed that recovery of FA is 100%, and that FA is the only metal-binding ligand. Lower recoveries and/or the presence of other non-humic ligands would tend to increase values shown. 

Such preparations can be analysed for their content of metal, which will enable one to calculate their equivalent weights. Sodium arabinate gave in this way the mean value of 1202, a figure which after subtraction of 22 (i. e. — Na + H) is in good agreement with the equivalent weight of arabinic acid, viz.y 1177, found by Thomas and Mxtrray from titration curves of the latter substance in solution. 

Corrosion rates can also be calculated from icon- values, expressed in mA cm by 128.66 X ( corr X equivalent weight of the metal... 

These (and the values for metals in the table on p. 666) are really equivalent weights, but Kirwan did not recognise this. He says ... 

Atomic Weight.—The chemical properties of caesium indicate its close relationship to the other alkali-metals. It is univalent, forming compounds of the type CsX, its atomic weight and hydrogen equivalent being the same. Its atomic weight is of the order Cs =133 a value conformed by the specific-heat method (Vol. I., p. 88) by the isomorphism of the caesium compounds with those of potassium, ammonium, and rubidium (Vol. I., p. 74) by the correspondence of the properties of the metal and its compounds with the periodic system by the formation of a univalent cation and by the depression of the freezing-point of bismuth chloride and mercuric chloride produced by caesium chloride. 

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